IsPostBack coming as true even on the first time page load

Question

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Hi,

I am using below javascript method to pass data from one page to another and reading it there:

JavaScript

function GotoActivity(accountNumber, noteID) {

    var url = "/ActivitySearch/Activity.aspx";
    document.forms[0].action = url;
    document.forms[0].Data1.value = accountNumber;
    document.forms[0].Data2.value = noteID;
    document.forms[0].__VIEWSTATE.name = 'NOVIEWSTATE';
    document.forms[0].submit();
}

I am able to get the values of Data1 and Data2 successfully on my second page but I am facing two problems here:

1) When it navigates to the second page it gives the yellow page with the error:

"Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation."

If I declare EnableEventValidation="false" this error goes but I have seen it written in almost all the places that it is not recommended.

2) On the secong page the "IsPostBack" property always comes as True even for the first time the page load after navigation.

Thanks in Advance,
Deepti

Posted 29-Dec-13 22:53pm

deeptibansal

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SarveshShukla · Answer 1 · 2013-12-30T00:13:00

Solution 1

did u try this
http://stackoverflow.com/questions/228969/invalid-postback-or-callback-argument-event-validation-is-enabled-using-page[^]

Posted 30-Dec-13 0:13am

SarveshShukla

Comments

deeptibansal 30-Dec-13 9:48am

Yes I read that link, but it does not help in my situation and does not provide any reason for Point#2 of my question at all.

I did the basic google for my problem before putting it here.

deeptibansal · Answer 2 · 2014-01-27T20:30:00

Solution 2

I used the jquery method Post to post the data and then redirect to the page. It worked well.

Posted 27-Jan-14 20:30pm

deeptibansal

V5709 · Answer 3 · 2014-01-27T20:46:00

Solution 3

Check this Link

Posted 27-Jan-14 20:46pm

V5709

Stony Chen · Answer 4 · 2015-01-19T15:16:00

Recent days, I got the same problem. the cause is the windows security updates.
refer to https://technet.microsoft.com/library/security/2905247[^]

You might insert below code, can resolve your issue.

C#

var objForm = document.forms[0]

if (objForm) {
    var hid__VIEWSTATE = objForm.elements['__VIEWSTATE'];
    var hid__EVENTARGUMENT = objForm.elements['__EVENTARGUMENT'];
    var hid__EVENTTARGET = objForm.elements['__EVENTTARGET'];

    if (hid__VIEWSTATE) {
        hid__VIEWSTATE.disabled = true;
    }

    if (hid__EVENTARGUMENT) {
        hid__EVENTARGUMENT.disabled = true;
    }

    if (hid__EVENTTARGET) {
        hid__EVENTTARGET.disabled = true;
    }
}

Reference http://www.dotblogs.com.tw/rainmaker/archive/2014/09/23/146668.aspx[^]